The phrase "most gung ho" refers to someone who is very enthusiastic and eager for a particular activity. Antonyms for this phrase could be "unenthusiastic," "indifferent," "apathetic," "disinterested," "bored," "reluctant," or "resistant." These words denote a lack of excitement or interest in the activity at hand. Alternatively, antonyms for "most gung ho" could be phrases like "cautious," "reserved," "prudent," or "measured," which suggest a more thoughtful or careful approach to the task. Ultimately, the choice of antonyms will depend on the context and intended meaning of the phrase "most gung ho.